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Robust Estimation Of Multivariate Failure Data With Time-Modulated Frailty, Pingfu Fu, J. Sunil Rao, Jiming Jiang

Journal of Modern Applied Statistical Methods

A time-modulated frailty model is proposed for analyzing multivariate failure data. The effect of frailties, which may not be constant over time, is discussed. We assume a parametric model for the baseline hazard, but avoid the parametric assumption for the frailty distribution. The well-known connection between survival times and Poisson regression model is used. The parameters of interest are estimated by generalized estimating equations (GEE) or by penalized GEE. Simulation studies show that the procedure is successful to detect the effect of time-modulated frailty. The method is also applied to a placebo controlled randomized clinical trial of gamma interferon, a …

Some Reflections On Significance Testing, Thomas R. Knapp

Journal of Modern Applied Statistical Methods

This essay presents a variation on a theme from my article “The use of tests of statistical significance”, which appeared in the Spring, 1999, issue of Mid-Western Educational Researcher.

Vol. 1, No. 2 (Full Issue), Jmasm Editors

Journal of Modern Applied Statistical Methods

No abstract provided.

Null Distribution Of The Likelihood Ratio Statistic For Feed-Forward Neural Networks, Douglas Landsittel, Harshinder Singh, Vincent C. Arena, Stewart J. Anderson

Journal of Modern Applied Statistical Methods

Despite recent publications exploring model complexity with modern regression methods, their dimensionality is rarely quantified in practice and the distributions of related test statistics are not well characterized. Through a simulation study, we describe the null distribution of the likelihood ratio statistic for several different feed-forward neural network models.

Combining Quantum Mechanical Calculations And A Χ^2 Fit In A Potential Energy Function For The Co_2 + O^+ Reaction, Ellen F. Sawilowsky

Journal of Modern Applied Statistical Methods

In order to compute a highly accurate statistical rate constant for the CO2 + O⁺ reaction, it is necessary to first calculate the potential energy of the system at many different geometric configurations. Quantum mechanical calculations are very time-consuming, making it difficult to obtain a sufficient number to allow for accurate interpolation. The number of quantum mechanical calculations required can be significantly reduced by using known relations in classical physics to calculate energy for configurations where the oxygen is relatively far from the CO2. A chi-squared fit to quantum mechanical points is obtained for these configurations, and the resulting …

Type I Error Rates For Rank-Based Tests Of Homogeneity Of Slopes, Alan J. Klockars, Tim P. Moses

Journal of Modern Applied Statistical Methods

The purpose of this study was to explicate two issues concerning the standard and rank based test of homogeneity of slopes. Two alternative ranking methods intended to address nonnormality and additive treatment effect patterns were developed and compared in terms of their ability to control Type I error. The results replicated previous findings of inflated Type I error rates with leptokurtic curves and with rank based tests with some patterns of additive treatment effects. The new nonparametric procedures generally control Type I error although they were slightly inflated with skewed distributions.

Exploration Of Distributions Of Ratio Of Partial Sum Of Sample Eigenvalues When All Population Eigenvalues Are The Same, Moonseong Heo

Journal of Modern Applied Statistical Methods

This paper explores empirically the first two moments of ratio of the partial sum of the first two sample eigenvalues to the sum of all eigenvalues when the population eigenvalues of a covariance matrix are all the same. Estimation of the first two moments can be practically crucial in assessing non-randomness of observed patterns on planar graphical displays based on lower rank approximations of data matrices. For derivation of the moments, exact and large sample asymptotic distributions of the sample ratios are reviewed but neither can be applicable to derivation of the moments. Therefore, I rely on simulations, where data …

Chronic Disease Data And Analysis: Current State Of The Field, Ralph D'Agostino Sr., Lisa M. Sullivan

Journal of Modern Applied Statistical Methods

Chronic disease usually spans years of a person’s lifetime and includes a disease free period, a preclinical, or latent period, where there are few overt signs of disease, a clinical period where the disease manifests and is eventually diagnosed, and a follow-up period where the disease might progress steadily or remain stable. It is often of interest to investigate the relationship between risk factors measured at a point in time (usually during the disease free or preclinical period), and the development of disease at some future point (e.g., 10 years later). We outline some popular designs for the identification of …

Rydberg-Atom Population Transfer By Population Trapping In A Chirped Microwave Pulse, J. Lambert, Michael Noel, T. F. Gallagher

Physics Faculty Research and Scholarship

We demonstrate that Rydberg atoms can be transferred to states of lower principal quantum number by exposing them to a frequency chirped microwave pulse. Specifically, we have transferred n=75 atoms to n=66 with a 400-ns pulse chirped from 7.8 to 11.8 GHz. In spite of the large number of coupled levels, using a simplified model we can describe the process reasonably well as a sequence of adiabatic rapid passages.

Poincaré Types Solutions Of Systems Of Difference Equations, Raghib Abu-Saris, Saber Elaydi, Sophia Jang

Mathematics Faculty Research

No abstract provided.

Vowel-Consonant Patterns (Part 1), Susan Thorpe

Word Ways

In Vowel-Consonant Patterns (Word Ways 77221), Philip Cohen presented a list of words based on 125 of the possible 128 (2^7) 7-letter vowel-consonant (V-C) patterns. Somewhat belatedly, this has inspired me to undertake similar exercises for 8-letter words and 9-letter words. As Cohen's article appeared more than 25 years ago, before most of us were acquainted with Word Ways, I have also taken the liberty of repeating his 7-letter exercise, using different words wherever appropriate. Part 1 considers 7- and 8-letter words; Part 2 considers 9-letter words, and also analyses the patterns with regard to the number of words they …

The Alphabet Cube And Beyond, Darryl Francis

Word Ways

Two-letter words can be plotted as points on a two-dimensional plane. The first letter of a two-letter word is plotted against the x-axis, and the second letter is plotted against the y-axis. Along the x-axis, x=1 is equivalent to the letter A, x=2 is equivalent to the letter B, and so on, with x=26 being equivalent to the letter Z. Similarly, plot the second letter of a word on the y-axis, with y=1 equivalent to A, y=2 equivalent to B, etc. So, for example, take the two-letter word HE. The H corresponds to x=8 and the E corresponds to y=5. …

Kickshaws

Word Ways

A collection of linguistic kickshaws.

Faculty Focus, November 2002, Vol. 2 No. 2, California State University, Monterey Bay

Faculty Focus

PGCC and Faculty Together Support Student Mental Health -- What's New in the Colleges? -- Let Students Show What They Know -- Ongoing Race in the Classroom Series -- One Step Closer to Initial Accreditation -- Formative and Summative Assessment as Learning -- Recent Faculty Scholarship -- How do Institutes Use Best Practices in Assessment for Student Learning? -- Faculty Study Courses in Alignment Project -- Online Learning Program Discussed at TLTR

Campus Connection, November 2002, Vol. 4 No. 5, California State University, Monterey Bay

Campus Connection

What's Up With Our Roads? -- Proposition 47 Hits Home -- Steve Schmeiser Named Manager Of Major Gifts -- Where's That Building? -- CSUMB Gets $1.14 Million Grant To Grow Teachers -- There's Plenty Of Support With Faculty Mentoring -- Scholarship Endowment Campaign Gets First Donation -- Changes In Conference And Event Services Staffing -- Chris Hasegawa On Special Fundraising Assignment -- What's In A Name? -- Dr. Massouda Jalal Speaks At CSUMB -- In Memoriam - Margaret Parker -- Join The Campaign Kick-Off -- Fort Ord Alumni Association Honors CSUMB Students -- Deanship For Marshal Moroh -- New Staff …

News & Blues, V. 03, N. 04, Gso News, Stony Brook University.

The Graduate

v. : ill.; 32 cm (original analog pub.),News and Blues. | News and Views. | The GSO News and Blues. | The Graduate Times.

The Nadca Probe, Issue 225

The Probe: Newsletter of the National Animal Damage Control Association

Beaver Management- Nevada 1942-1943

CALENDAR OF UPCOMING EVENTS

If I think an animal may have been poisoned or exposed to a toxin, is there a source of information-a non-human animal poison control center?

"The Critter Control Handbook: Pro Secrets for Stopping Sneaky Squirrels & Other Crafty Critters in Their Tracks" by Dan "The Critter Man" Hershey.

U.S. Sportsmen's Alliance Launches Assault on an Animal Rights Movement

Rodent Rabies - Bolivia

Counter Terrorism Includes Animal Rights and Eco-Violence

Habitat Structure And Alarm Call Dialects In Gunnison's Prairie Dog (Cynomys Gunnisoni), Bianca S. Perla, C. N. Slobodchikoff

Habitat Assessment and Management Collection

We examined the relationship between habitat structure and alarm call characteristics in six colonies of Gunnison’s prairie dogs (Cynomys gunnisoni) near Flagstaff, Arizona, before and after a mid-summer vegetation change. We found significant differences in alarm call characteristics between colonies, confirming the existence of alarm call dialects. Differences in frequency components but not temporal components of calls were associated with differences in habitat structure. Playback experiments revealed that differences in alarm call structure affected acoustic transmission of calls through the local habitat. Thus, we identify habitat structure as one factor that may contribute to alarm call differences between colonies of …

Report To The Minister For Agriculture, Forestry And Fisheries By The Integrated Fisheries Management Review Committee, Department Of Fisheries

Fisheries Management Papers

The Integrated Fisheries Management Review Committee was established to develop a strategy to integrate the management and sustainable use of fish resources. The Committee’s report proposes an alternative management framework and a set of guiding principles for allocating fish stocks to ensure optimal benefits are realised for the WA community. The report does not, and was not intended to, address specific allocation issues in particular fisheries – this will be a function of the framework and processes put in place following this review.

Using Appropriateness Measurement To Detect Realistic Faking Of Personality Tests, Brian Holt

Masters Theses & Specialist Projects

Research has shown that personality tests are susceptible to faking and that test takers do indeed take advantage of this vulnerability. This faking creates a problem when organizations use personality tests as screening tools for candidates for employment. Among the methods available to detect faking, appropriateness measurement (i.e., examining how well a pattern of responses fit item characteristics) has not been thoroughly investigated. The present study examines whether the two most popular appropriateness indices, Z3 and F2, are capable of detecting response distortion among test takers instructed to answer honestly versus fake. The groups demonstrated differences between overall mean scores, …

Magnetic Relaxation Phenomena In The Superspin-Glass System [Co80Fe20/Al2O3]10, Sarbeswar Sahoo, O. Petracic, Christian Binek, Wolfgang Kleemann, J. B. Sousa, Susana Cardoso De Freitas, P. P. Freitas

Christian Binek Publications

Relaxation and temperature cycles of thermoremanent magnetization, M^TRM, in the superspin-glass phase of [Co₈₀Fe₂₀ (0.9 nm)/Al₂O₃ (3 nm)] ₁₀ have been investigated. The relaxation of M^TRM exhibits ageing phenomena. In negative temperature cycles for temperature steps larger than 1 K the magnetic state is retrieved (memory effect) on returning to the measurement temperature. This property is independent of the application of a field step during intermediate cooling. In positive temperature cycles the relaxation is suppressed after temporary heating. The observations are discussed in the light of both the droplet and the …

Calcium Binding To Calmodulin Mutants Monitored By Domain-Specific Intrinsic Phenylalanine And Tyrosine Fluorescence, W. S. Vanscyoc, B. R. Sorensen, E. Rusinova, William Laws, J. B. A. Ross, M. A. Shea

Chemistry and Biochemistry Faculty Publications

Cooperative calcium binding to the two homologous domains of calmodulin (CaM) induces conformational changes that regulate its association with and activation of numerous cellular target proteins. Calcium binding to the pair of high-affinity sites (III and IV in the C-domain) can be monitored by observing calcium-dependent changes in intrinsic tyrosine fluorescence intensity (lambda(ex)/lambda(em) of 277/320 nm). However, calcium binding to the low-affinity sites (I and II in the N-domain) is more difficult to measure with optical spectroscopy because that domain of CaM does not contain tryptophan or tyrosine. We recently demonstrated that calcium-dependent changes in intrinsic phenylalanine fluorescence (lambdaex/lambdaem of …

Geosciences Newsletter- 2002, Department Of Geosciences

Geological and Environmental Sciences News

Vol.1, No. 27

• Dear Alumni and Friends
• Faculty News
• Department News
• Core Lab
• Geosciences Departmental History
• Graduate Student News
• Awards & Graduations
• Alumni News
• Donations

Human Life As A Foundation For Ethical Health-Care Decisions: A Synthesis Of The Work Of E. D. Pellegrino And W. A. Wallace., Beverly J.B. Whelton

The Linacre Quarterly

No abstract provided.

19th Annual Reception Bibliography, 2001-2002, Leonard H. Axe Library

Bibliographies

Since 1984, Leonard H. Axe Library at Pittsburg State University has honored book authors and other creators for their outstanding scholarship and contributions to their fields.

The Murray State News, November 1, 2002, The Murray State News

Murray State University Collection

No abstract provided.

Statistical Characteristics Ofsprite Halo Events Using Coincident Photometric And Imaging Data, R. Miyasato, Michael J. Taylor, H. Fukunishi, Y. Takahashi, H. Nielsen

All Physics Faculty Publications

Sprite halos are brief, diffuse flashes, which occur at the top of a sprite and precede the development of streamer structures at lower altitudes. We have investigated the characteristics of sprite halos in detail using coincident photometric and imaging data obtained during the Sprites'96 and '99 campaign in Colorado and Wyoming, USA. It is found that the average altitude of the centroid of the halo emission and the mean horizontal diameter of the halo events are ∼80 and ∼86 km, respectively, while the average speed of the descending motion of the sprite halos was ∼4.3 × 10⁷ m/s. It …

Nonlocal Electrodynamic Modeling Of Fluorescence Characteristics For Molecules In A Spherical Cavity, Pui T. Leung, M. H. Hider

Physics Faculty Publications and Presentations

The emission characteristics for molecules in a spherical metallic microcavity are computed using a nonlocal electrodynamic model, based on a theory previously published by Fuchs and Claro [Phys. Rev. B 35, 3722 (1987)] for the multipole polarizability of a sphere. Both radially and tangentially oriented molecules at arbitrary locations inside the cavity are considered, and the results are compared with those from both the local response theory and those for molecules outside a spherical particle. The issue of reciprocity of the solutions for each of the sphere and cavity cases, respectively, is examined in the light of the nonlocal effects. …

Nitrogen Loading Into An Urban Estuary: Lake Pontchartrain (Louisiana, U.S.A.), R. Eugene Turner, Q. Dortch, Dubravko Justic, Erick M. Swenson

Faculty Publications

We constructed a nitrogen loading budget for the Lake Pontchartrain watershed located north of New Orleans, Louisiana (U.S.A.). Water quality measurements, discharge estimates, and literature values were used to establish the annual and seasonal variations in loading rates for total nitrogen and nitrate. The relatively stable annual loadings (million kg N) are about 10× that of the pre-settlement nitrogen loading, and come from atmosphere (1.3), the watershed (7.8), pumped urban runoff from New Orleans (1.0), and leakage through the Bonnet Carré flood control structure (0.5–0.9). Relatively minor additional amounts come from nitrogen fixation in the Lake. Occasional openings of the …

Measurements Of Pernitric Acid At The South Pole During Iscat 2000, D Slusher, L Gregory Huey, D Tanner, G Chen, D D. Davis, Martin Buhr, J Nowak, Fred Eisele, E Kosciuch, R L. Mauldin, Barry Lefer, R E. Shetter, Jack E. Dibb

Earth Sciences

The first measurements of pernitric acid at the South Pole were performed during the second Investigation of Sulfur Chemistry in the Antarctic Troposphere (ISCAT 2000). Observed HO2NO2 concentrations averaged 25 pptv. Simple steady-state calculations constrained by measurements show that the lifetime of pernitric acid was largely controlled by dry deposition, with thermal decomposition becoming increasingly important at warmer temperatures. We determined that the pernitric acid equilibrium constant is less uncertain than indicated in the literature. One consequence of pernitric acid deposition to the snow surface is that it is an important sink for both NOx and HOx. Another is that …